package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            //计算日期，计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的营业额
        List<Double> turnoverList=new ArrayList<>();
        for (LocalDate date:dateList){
            //查询date日期对应的营业额数据，营业额是指：状态为"已完成"的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sim(amount) from orders where order_time > beginTime and order_time < endTime and status=5
            Map map=new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover=orderMapper.sumByMap(map);
            turnover=turnover==null ? 0.0:turnover;
            turnoverList.add(turnover);
        }

        //返回封装结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            //计算日期，计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量
        List<Integer> newUserList=new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList=new ArrayList<>();

        for (LocalDate date:dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map=new HashMap<>();
            map.put("end",endTime);

            //总用户数量
            Integer totalUser=userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser=userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            //计算日期，计算指定日期的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderCountList=new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList=new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date:dateList){
            //查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount=orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validOrderCount=validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate=0.0;
        if(totalOrderCount!=0){
            //计算订单完成率
            orderCompletionRate=(validOrderCount.doubleValue()/totalOrderCount);
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .validOrderCount(validOrderCount)
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内销量排名前10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> saleTop10 = orderMapper.getSaleTop10(beginTime, endTime);
        List<String> names=saleTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> nembers=saleTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names,","))
                .numberList(StringUtils.join(nembers,","))
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据   ---查询最后30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData
                (LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过POI将数据导入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

       try {
           //基于模板文件创建一个新的Excel文件
           XSSFWorkbook excel=new XSSFWorkbook(in);

           //获取表格文件的sheet页
           XSSFSheet sheet = excel.getSheet("Sheet1");

           //填充数据--时间
           sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin+"至"+dateEnd);

           //获得第4行
           XSSFRow row = sheet.getRow(3);
           row.getCell(2).setCellValue(businessDataVO.getTurnover());
           row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
           row.getCell(6).setCellValue(businessDataVO.getNewUsers());

           //获得第5行
           row=sheet.getRow(4);
           row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
           row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

           //填充明细数据
           for (int i=0;i<30;i++){
               LocalDate date = dateBegin.plusDays(i);
               //查询某一天的营业数据
               BusinessDataVO businessData = workspaceService.getBusinessData
                       (LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

               //获得某一行
               row = sheet.getRow(7 + i);
               row.getCell(1).setCellValue(date.toString());
               row.getCell(2).setCellValue(businessData.getTurnover());
               row.getCell(3).setCellValue(businessData.getValidOrderCount());
               row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
               row.getCell(5).setCellValue(businessData.getUnitPrice());
               row.getCell(6).setCellValue(businessData.getNewUsers());
           }

           //3.通过输出流将Excel文件下载到客户端浏览器
           ServletOutputStream out = response.getOutputStream();
           excel.write(out);

           //关闭资源
           out.close();
           excel.close();
       }catch (IOException e){
           e.printStackTrace();
       }

    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status){
        Map map=new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }
}
